.\" Generated from pam_vprompt.c by gendoc.pl
.Dd May 31, 2025
.Dt PAM_VPROMPT 3
.Os
.Sh NAME
.Nm pam_vprompt
.Nd call the conversation function
.Sh SYNOPSIS
.In sys/types.h
.In security/pam_appl.h
.Ft "int"
.Fn pam_vprompt "const pam_handle_t *pamh" "int style" "char **resp" "const char *fmt" "va_list ap"
.Sh DESCRIPTION
The
.Fn pam_vprompt
function constructs a string from the
.Fa fmt
and
.Fa ap
arguments using
.Xr vsnprintf 3 ,
and passes it to the given PAM context's
conversation function.
.Pp
The
.Fa style
argument specifies the type of interaction requested, and
must be one of the following:
.Bl -tag -width 18n
.It Dv PAM_PROMPT_ECHO_OFF
Display the message and obtain the user's response without
displaying it.
.It Dv PAM_PROMPT_ECHO_ON
Display the message and obtain the user's response.
.It Dv PAM_ERROR_MSG
Display the message as an error message, and do not wait
for a response.
.It Dv PAM_TEXT_INFO
Display the message as an informational message, and do
not wait for a response.
.El
.Pp
A pointer to the response, or
.Dv NULL
if the conversation function did
not return one, is stored in the location pointed to by the
.Fa resp
argument.
.Pp
The message and response should not exceed
.Dv PAM_MAX_MSG_SIZE
or
.Dv PAM_MAX_RESP_SIZE ,
respectively.
If they do, they may be truncated.
.Pp
.Sh RETURN VALUES
The
.Fn pam_vprompt
function returns one of the following values:
.Bl -tag -width 18n
.It Bq Er PAM_SUCCESS
Success.
.It Bq Er PAM_BUF_ERR
Memory buffer error.
.It Bq Er PAM_CONV_ERR
Conversation failure.
.It Bq Er PAM_SYSTEM_ERR
System error.
.El
.Sh SEE ALSO
.Xr pam 3 ,
.Xr pam_error 3 ,
.Xr pam_info 3 ,
.Xr pam_prompt 3 ,
.Xr pam_strerror 3 ,
.Xr pam_verror 3 ,
.Xr pam_vinfo 3 ,
.Xr vsnprintf 3
.Sh STANDARDS
The
.Fn pam_vprompt
function is an OpenPAM extension.
.Sh AUTHORS
The
.Fn pam_vprompt
function and this manual page were
developed for the
.Fx
Project by ThinkSec AS and Network Associates Laboratories, the
Security Research Division of Network Associates, Inc.\& under
DARPA/SPAWAR contract N66001-01-C-8035
.Pq Dq CBOSS ,
as part of the DARPA CHATS research program.
.Pp
The OpenPAM library is maintained by
.An Dag-Erling Sm\(/orgrav Aq Mt des@des.dev .
